US2656248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammonium sulfate production
Assignee: Phillips Petroleum Co
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Filing: 1949-10-21
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Granted: 1953-10-20
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Expires: 1969-10-21
Abstract
No abstract record available.
Inventors
- 👤 Russell K Simms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:06
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/24; C01C1/242
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
A PROCESS FOR THE MANUFACTURE OF CRYSTALLINE AMMONIUM SULFATE IN A PLURALITY FO CRYSTALLIZATION UNITS WHEREIN THE FREE ACID OF THE LIQUOR IS AT VARIANCE FROM UNIT TO UNIT AND IS TO BE MAINTAINED WITHIN AN OPTIMUM RANGE WHICH PROCESS COMPRISES ARRANGING THE SEVERAL CRYSTALLIZATION UNITS FOR PARALLEL OPERATION SO THAT WHEN WATER AMMONIA AND SULFURIC ACID ARE INTRODUCED TO SAID UNITS THE FREE ACID CONTENT IN EACH UNIT IS APPROXIMATELY THE SAME AND WITHIN THE RANGE OF 0.2 TO 0.5 MOL PER CENT EXCESS BASED ON AMMONIA WITHDRAWING AND ADMIXING THE MAGMA FROM CRYSTAL FORMATION IN THE SEVERAL CRYSTALLIZATION UNITS WHEN THE CRYSTALS HAVE REACHED A SIZE IN THE RANGE OF 20 TO 60 MESH AND PASSING THE RESULTING ADMIXTURE TO A SEPARATION ZONE, SEPARATELY RECOVERING AMMONIUM SULFATE CRYSTALS AND MOTHER LIQUOR IN SAID SEPARATION ZONE, TO ASSIST IN KEEPING THE FREE ACID CONTENT IN EACH CRYSTALLIZER WITHIN THE RANGE OF 0.2 TO 0.5 MOL PER CENT ADJUSTING SAID FREE ACID CONTENT OF RECOVERED MOTHER LIQUOR TO WITHIN SAID RANGE, AND RECYCLING THE THUS TREATED MOTHER LIQUOR TO THE VARIOUS EVAPORATIVE CRYSTALLIZATION UNITS.
Claim 2
Dependent Claim
184 words
A PROCESS FOR THE MANUFACTURE OF CRYSTALLINE AMMONIUM SULFATE IN A PLURALITY FO CRYSTALLIZATION UNITS WHEREIN THE FREE ACID OF THE LIQUOR IS AT VARIANCE FROM UNIT TO UNIT AND IS TO BE MAINTAINED WITHIN AN OPTIMUM RANGE WHICH PROCESS COMPRISES ARRANGING THE SEVERAL CRYSTALLIZATION UNITS FOR PARALLEL OPERATION SO THAT WHEN WATER AMMONIA AND SULFURIC ACID ARE INTRODUCED TO SAID UNITS THE FREE ACID CONTENT IN EACH UNIT IS APPROXIMATELY THE SAME AND WITHIN THE RANGE OF 0.2 TO 0.5 MOL PER CENT EXCESS BASED ON AMMONIA WITHDRAWING AND ADMIXING THE MAGMA FROM CRYSTAL FORMATION IN THE SEVERAL CRYSTALLIZATION UNITS WHEN THE CRYSTALS HAVE REACHED A SIZE IN THE RANGE OF 20 TO 60 MESH AND PASSING THE RESULTING ADMIXTURE TO A SEPARATION ZONE, SEPARATELY RECOVERING AMMONIUM SULFATE CRYSTALS AND MOTHER LIQUOR IN SAID SEPARATION ZONE, TO ASSIST IN KEEPING THE FREE ACID CONTENT IN EACH CRYSTALLIZER WITHIN THE RANGE OF 0.2 TO 0.5 MOL PER CENT ADJUSTING SAID FREE ACID CONTENT OF RECOVERED MOTHER LIQUOR TO WITHIN SAID RANGE, AND RECYCLING THE THUS TREATED MOTHER LIQUOR TO THE VARIOUS EVAPORATIVE CRYSTALLIZATION UNITS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |